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Industry and Geographic Information - Additional Information (Details) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Major Customer [Line Items]
Number of reportable segments \| segment	1
Sales
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%
Customer Concentration Risk \| Non-U.S. Customers
Revenue, Major Customer [Line Items]
Sales to customers outside the U.S.	$ 124.3	$ 21.6
Accounts receivable	$ 10.1		$ 18.8
Customer Concentration Risk \| Sales
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	43.00%	55.00%
Customer Concentration Risk \| Sales \| Non-U.S. Customers
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	32.00%	13.00%
Credit Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable	$ 38.6		$ 44.4
Credit Concentration Risk \| Accounts receivable \| Minimum
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	10.00%		10.00%